This document is a report detailing a fatal incident that occurred during a tank entry on a product tanker. It outlines the sequence of events leading up to the accident, which resulted in the deaths of two subcontracted technicians due to exposure to hydrogen sulfide (H2S) gas. The report presents a timeline of the accident, highlighting procedural failures and organizational challenges that contributed to the incident. It discusses the lack of adequate safety measures, including insufficient ventilation and failure to properly communicate tank inspection plans among crew members. The report also emphasizes the need for improved safety culture and procedural compliance within the shipping industry to prevent similar occurrences in the future. Key factors identified include a false sense of safety, gaps in crew communication, and the hierarchical dependency on a single individual for safety management. The document concludes with a call to action for fostering a culture of safety and accountability among crew members.